Flash Flood — Grafton, New Hampshire

2017-07-01 · near Orford, Grafton, New Hampshire

$4.0M

Property damage

Event narrative

Thunderstorms produced 2 to 5 inches of rain in Orford washing out portions of Route 25A and numerous roads along the Connecticut River.

Wider weather episode

A very strong shortwave and associated cold front were approaching from the west on the morning of July 1st. Ahead of the front, a very warm and moist air mass was in place over New England with values of precipitable water around 2 inches. Strong directional and speed shear contributed to numerous super cells that produced damaging winds. In addition, very heavy rain associated with these cells produced extensive flash flooding to many area roads with damage totaling in the millions.

View location on OpenStreetMap → (43.8896, -72.1034)

Source: NOAA Storm Events Database, event_id 715626. Narrative written by the NWS forecast office that issued the report.